Over the years I have booked airfare, hotel, cars you name it on Expedia, Travelocity and Orbitz. If I am trying to save a buck, I just go with whomever is offering the best deal at the time. All three are reliable, although I prefer Expedia and Travelocity. If you don't have an airline preference, I would check all all 3, as they offer an airline search, which could take alot of time if you have to check each individual airline. Also, if you have any problems they have customer service number where you can speak to an agent and they will assist you too same as booking direct with an airline! Good luck.